Arduino refrigerator

/************************************************************
 * Arduino Controlled Refrigerator
 * For Arduino Mega Only
 * 
 * Code written on 2013-07-05, modified on 2016-03-31 by HLETRD
 ************************************************************/

#include <EEPROM.h>
#include <LiquidCrystal.h>

#define temp_default 2
////////////////////////////////////////////
#define Sensor1 8 //analog pin, for LM35DZ
#define Sensor2 9 //analog pin, for LM35DZ
#define Power1 20 //Power for sensor 1
#define Power2 21 //Power for sensor 2
#define GND1 18 //GND for sensor 1
#define GND2 19 //GND for sensor 2
#define Relay_pin 22 //pin for driving relays / FETs / etc..
//////////Modify here to configure//////////

LiquidCrystal lcd(8, 9, 4, 5, 6, 7); //for LCD & Keypad Shield

int Box_Count;
int tempset, tempreal = 0;
bool buttonnew = false;

byte arrowUD[8] = {
    0x04,0x0E,0x1F,0x00,0x00,0x1F,0x0E,0x04};
byte degree[8] = {
    0x06,0x09,0x09,0x06,0x00,0x00,0x00,0x00};

void setup(){
    tempset = EEPROM.read(0);
    if (tempset < 0 || tempset > 70) tempset = temp_default;

    lcd.begin(16, 2);
    lcd.createChar(0, arrowUD);
    lcd.createChar(1, degree);

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Simple Incubator");
    lcd.setCursor(0, 1);
    lcd.print("Preparing...");

    pinMode(Relay_pin, OUTPUT);
    digitalWrite(Relay_pin, LOW);
    pinMode(Power1, OUTPUT);
    digitalWrite(Power1, HIGH);
    pinMode(Power2, OUTPUT);
    digitalWrite(Power2, HIGH);
    pinMode(GND1, OUTPUT);
    digitalWrite(GND1, LOW);
    pinMode(GND2, OUTPUT);
    digitalWrite(GND2, LOW);
    
    delay(1000);
}

void loop(){
    analogReference(DEFAULT); //set analogRead's range to 1.1V
    int ain;
    for(int i = 0; i < 50; i++){
        ain = analogRead(0); //few input values following analogReference() may not be accurate.
        delay(1);
    }

    //LCD printing start
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("A refrigerator");
    lcd.setCursor(0, 1);
    lcd.print("SET");
    lcd.setCursor(3, 1);
    lcd.write((byte)0);
    lcd.setCursor(4, 1);
    if (tempset < 10) {
        lcd.print("0");
        lcd.setCursor(5, 1);
    }
    lcd.print(tempset);
    lcd.setCursor(6, 1);
    lcd.write((byte)1);
    lcd.setCursor(7, 1);
    lcd.print("C");
    lcd.setCursor(9, 1);
    lcd.print("NOW");
    lcd.setCursor(12, 1);
    if (tempreal < 10) {
        lcd.print("0");
        lcd.setCursor(13, 1);
    }
    lcd.print(tempreal);
    lcd.setCursor(14, 1);
    lcd.write((byte)1);
    lcd.setCursor(15, 1);
    lcd.print("C");
    //LCD Printing End

    //Feedback to button input
    ain = analogRead(0);
    if ((ain < 850) && (buttonnew == true)){
        buttonnew = false;
        if (ain < 650){
            if (ain < 450){
                if (ain < 250){
                    if (ain < 50){
                        //Right Key Pressed
                        if (tempset < 70) {
                            tempset++;
                            EEPROM.write(0, tempset);
                        }
                    } 
                    else {
                        //Up Key Pressed
                    }
                } 
                else {
                    //Down Key Pressed
                }
            } 
            else {
                //Left Key Pressed
                if (tempset > 0) {
                    tempset--;
                    EEPROM.write(0, tempset);
                }
            }
        } 
        else {
            //Select Key Pressed
        }
    } 
    else {
        //No Valid Key Pressed
        buttonnew = true;
    }
    //Feedback End

    //temperature control
    analogReference(INTERNAL1V1);
    for(int i = 0; i < 50; i++){
        ain = analogRead(Sensor1);  //few input values following analogReference() may not be accurate.
        ain = analogRead(Sensor2);
        delay(1);
    }

    long int analoginput = 0;
    for (int j = 0; j < 50; j++) {
        analoginput += analogRead(Sensor1);
        analoginput += analogRead(Sensor2);
        delay(1);
    }
    
    float tempC;
    tempC = (float)analoginput / 931;
    tempreal = (int)tempC;
    if (tempC < (float)tempset - 0.5 && tempset >= 2) {
        digitalWrite(Relay_pin, LOW);
    } 
    else {
        //Cooling
        digitalWrite(Relay_pin, HIGH);
    }
    //temparature control end
}